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    "-----------\n",
    "* 日期：2022-10-26 \\week 10(周三）\n",
    "* 课程：python\n",
    "* 记录人：凪\n",
    "-----------"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "62e0a09a",
   "metadata": {},
   "source": [
    "## 课堂习题练习"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "id": "50f120bf",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "0\n",
      "1\n",
      "2\n",
      "3\n"
     ]
    }
   ],
   "source": [
    "for i in range(4):\n",
    "    print(i)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "id": "1d4fafb1",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "请输入余额：6666\n",
      "--------商品列表---------\n",
      "商品编号：0 ['自行车', 299]\n",
      "商品编号：1 ['海绵宝宝', 66]\n",
      "商品编号：2 ['派大星', 66]\n",
      "商品编号：3 ['万圣节盲盒', 199]\n",
      "请输入商品编号：1\n",
      "您购买的商品已增加到购物车,您的余额还有; 6600\n",
      "--------商品列表---------\n",
      "商品编号：0 ['自行车', 299]\n",
      "商品编号：1 ['海绵宝宝', 66]\n",
      "商品编号：2 ['派大星', 66]\n",
      "商品编号：3 ['万圣节盲盒', 199]\n",
      "请输入商品编号：2\n",
      "您购买的商品已增加到购物车,您的余额还有; 6534\n",
      "--------商品列表---------\n",
      "商品编号：0 ['自行车', 299]\n",
      "商品编号：1 ['海绵宝宝', 66]\n",
      "商品编号：2 ['派大星', 66]\n",
      "商品编号：3 ['万圣节盲盒', 199]\n",
      "请输入商品编号：3\n",
      "您购买的商品已增加到购物车,您的余额还有; 6335\n",
      "--------商品列表---------\n",
      "商品编号：0 ['自行车', 299]\n",
      "商品编号：1 ['海绵宝宝', 66]\n",
      "商品编号：2 ['派大星', 66]\n",
      "商品编号：3 ['万圣节盲盒', 199]\n",
      "请输入商品编号：q\n",
      "您的购物车： [['海绵宝宝', 66], ['派大星', 66], ['万圣节盲盒', 199]]\n",
      "您的余额还有： 6335\n"
     ]
    }
   ],
   "source": [
    "product_list = [\n",
    "    [\"自行车\",299],\n",
    "    [\"海绵宝宝\",66],\n",
    "    [\"派大星\",66],\n",
    "    [\"万圣节盲盒\",199]\n",
    "]\n",
    "shopping_car = []\n",
    "Alipay = int(input(\"请输入余额：\"))\n",
    "while True:\n",
    "    print(\"--------商品列表---------\")\n",
    "    for i in range(4):\n",
    "        print(\"商品编号：\"+str(i),product_list[i])\n",
    "    user_choice = input(\"请输入商品编号：\")\n",
    "    # 情景1：用户输入了商品编号：shopping\n",
    "    if user_choice.isdigit():\n",
    "        # 判断钱够不够，商品是谁？==> product_[list(user_choice)][1]\n",
    "        if Alipay >= product_list[int(user_choice)][1]:\n",
    "            Alipay = Alipay - product_list[int(user_choice)][1]\n",
    "            shopping_car.append(product_list[int(user_choice)])\n",
    "            print(\"您购买的商品已增加到购物车,您的余额还有;\",Alipay)\n",
    "        else:\n",
    "            print(\"您的余额已不足，请更换支付方式\")\n",
    "    # 情景2：用户输入“q”,退出购买\n",
    "    elif user_choice == \"q\":\n",
    "        print(\"您的购物车：\",shopping_car)\n",
    "        print(\"您的余额还有：\",Alipay)\n",
    "        break\n",
    "    else:\n",
    "        print(\"您输入的商品不存在或输入有误，请重新尝试\")"
   ]
  }
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